Mask



FIG. 1 is a front view of a first embodiment of a mask showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a front perspective view thereof;

FIG. 8 is a rear perspective view thereof;

FIG. 9 is another rear perspective view thereof;

FIG. 10 is a front view of a second embodiment of a mask showing my new design;

FIG. 11 is a rear view thereof;

FIG. 12 is a bottom view thereof;

FIG. 13 is a top view thereof;

FIG. 14 is a left side view thereof;

FIG. 15 is a right side view thereof;

FIG. 16 is a front perspective view thereof;

FIG. 17 is a rear perspective view thereof; and,

FIG. 18 is another rear perspective view thereof.

The broken lines depict portions of the mask that form no part of the claimed design. 

CLAIM I claim the ornamental design for a mask, as shown and described. 